Cutter-head



A. B. LANDIS.

CUTTER HEAD.

APPLICATION FILED JAN. a, 1919.

Patented J 11116 29,1920.

2 SHEETS-SHEET I.

INVENTOR.

0) I W M WITNESS:

A. B. LANDIS.

CUTTER HEAD.

APPLICATION FILED JAN- 5,1919.

43 I S ETSSHEET J3 II 3 1g VENZOR.

I WITNESS:

Patented June 29, 1920.

UNITED STATES.

PATENT OFFICE.

ABRAHAM B. LANDIS, 0F ENFIELD, PENNSYLVANIA, ASSIGNOR TO LANDIS MACHINE VANIA.

currnannan.

Application filed January 6, 1919. Serial No. 269,835.

details of construction of cutter heads more especially for cuttingscrew threads, whereby a cutter head for the purpose 1s attalned that is of durable and rigid construction,

one wherein the cutting die can be conveniently and accurately a'd'u'sted for different sizes of, work and rea ily opened and closed, wherein the adjusting, securlng and releasing of the cutter in" its holder can be accomplished with ease and rapidity, also forming a cutter head which completely excludes, cuttings the" working parts, all as will be hereinafter fully described and claimed.

Referring 'to the accompanying drawings which are madea part hereof'and'on which like reference characters indicate like or same parts Figure 1 is a face view of the cutter head showing the cutter holders and the cutters secured thereto with their arrangement.

Fig. ,2 is a longitudinal cross section of the cutter head taken on line 2-2of Fig. 1

Fig. 3 is a detail of the main die controlling ring. 1

Fig. 4 is a section on line 4+4 of Fig. 2.

Figs. 5, 6 and 7 are sections taken on line 55 of Figs. 1 and 2 showing the different positions with cutting die opened and closed.

In the said drawings the portions marked A represent the body ofv the cutter head, B the cutter holder, and C the cutters.

The body A is formed with bearings in its face, in which the cutter holders are pivotedequidistant and is mounted on-a spindle 1 of a machine in any approved manner. In the drawing however, it is secured to a sleeve 2 which can be however made an iptegral part of said spindle. It is mounted on said sleeve 2, which-is secured to the spindle, by an enlarged perforation adapted to fit over said sleeve and secured against rotary movement thereon by two pins 3 ABRAHAM B. LANDIS,

(only one of which is shown in- Fi 2) engagingin an aperture in the end 0 said sleeve and in the body and against lateral movement by a screw 4 through an aperture in the body and engaging a groove 5 in the sleeve 2 by a polnt thereon bearing on one side of the groove holding the body firmly against theend of the sleeve. The rear portion of the body is of less diameter than the front or face. On thefront ortion is mounted a ring 30 secured against lateral movement and flush with the face of the body but free for circular movement, which will be later referred to. I

The cutter holders'B have trunnions integral therewith which are fitted into bearings formed around the center of the body in its face. The holders form a side prop en of le Patent Patented June 29, 1920.

jection from their .trunnions and having 'a flange give a good surface which being ma-' chined at right angles and true with its trunnion forms a substantial bearing surface against the face of the body as an adequate support against the thrusts roduced. by the cutters doing their work. T secured to the face of the body by studs 7 which extend through a hole 8 in the center of the trunnion 6, said stud 7 being secured to the body at its inner end. A shoulder in the hole 8 at the outer end provides for holding the cutter holder against the face of the body by means of a sleeve nut 9 screw threadhey are ed on stud 7 which is locked into position by a screw plug 10 jammed against the end of stud 7. These cutter holders have each a stud 11 secured at their outer extremity and substantially on the opposite side of trunnion from the cutting point. i

The studs 11 engage with links 12 which are located in recesses 13 (see Fig. 3) in ring 30 which is mounted on the'body A, said. ring having studs 14 secured thereto on which the other end of links 12 are fitted making a connection between said ring and cutter holders by which a circular movement of said ring in one direction serves to open the cutter head .or die and the opposite direction to close it. The means of operating same being later described. Each holder B is provided with a dovetailed recess 24 for the reception of the cutter C. Adjacent to said recess is a screw threaded perforation for the reception of ascrew plug 15, a slot 16 is also formed adjacent r to said recess extending through and beond the said perforation for the reception of a block 17 formed with shoulders on its underside, engaging "with cross slots18 on;

the back of cutter C, a stem 19 passing through a slot 20 engages with the block 17 by which said block can be raised from the slots in the cutter. toadmitof its free re moval by sliding same endwise, and a spring serves to hold same in normal engage IIleI1t }V lth said cutter. The screw plug 15 enga es the block 17 by which it is moved to a justment for roper position of cutter C for cutting,sai block 17 due 'toitsengagement withthe slots 18' carries the cutter 3th it. The slot 20 is of such length to permit the movement of theblock a little more thanthe distance the slots in the cutter are spaced so that whenthe block is moved to the one extreme bythe plug 15 the block can be "raised and the screw plug returned to take hold of the next slots as will be' understood. The holder has a slot 21'cut' cutteragainst movement, the screw p makinga positive holding of the cutter C- against the thrust of cutting.

tion.

in its forward end joiningwith the slots 16 forthe purposeof making a slight ield ing to this part. A screw 22 inserte in a holeiin this holder which is "screw threaded on the inner side of slot 21, enlarged on the outer side and countersunk for the head of the screw 22 and serves to clamp said g 15 h v oscillation to open and close the die and attain all sizes of work to be. cut, is secured against lateralmovement in one direction by a shoulder 31 on the body and a corresponding one on the interior of the said ring, and airing 32 fitting around the body and secured thereto by screws 33 forming a shoulder securing'said ring in the 0ppositedirectionh A ing or sleeve 35 is fitted over the rear ipart ofbody A and'has an annular groove 36 for the purpose of engaging with itla'ny approved form of fork connection to move it longitudinally on the bodywhen same'is revolving, being free to move longitudinally butnotcircumferentially which is prevented by pins 37 jsecured in the body A the other endofwhichfis made to slide freely in the perforation in said ring or sleeve 35. "These pins take the circular thrust forming the support maintaining the size of the cutting die as may be seen by'further observation. on said ringor sleeve 35 is mounted another ring 30 mounted on; the body ,foi

ring 40 which is secured against longitu'dinal movement in one direction by a shoulder 41 and in the other direction by screws 42.

It is circumferentially and adjustably se-- cured tosleeve 35 by means of a tangential screw' 43 (see Fig. 4) which'requires no de scription. The object of this screw is to adjust the, cutter holders to secure-the correct size of the die as may be required. Said 'r1ngs4O and 30 are connected by one or more links (see Figs. 2, 5, 6 and 7). These links are pivoted with bifurcated studs or pins 51 and 52 one of which is secured for'slight rotation but against end movementin ring 30 and the other one similarly secured in ring 40. They are held agalnstend movement by a screw 37 in ring 30 and'a similar one. in ring 40 not shown. These screws engage with notches 54 and 53 in the studs 51 and-52 which secure their lateral movement, the notches permitting of the slight rotation of said studsfrequired as will be seen. I

i It will be noted and 40 are together the same as shown in in 5 the rings 30 Fig. 2 which is the closed position of the die.

This position causes .link 50 to stand at rightangles tothe studs 51 and 52 causing a lock .o'fthe die as will-readily be understood. In moving ring 40 away from ring 30 the position-shown in Fig. 6 is attained which due to the radial movement ofthe which are attached the cutter holders and this gives the open osition of thedie as will be 1 observed. against 30 again closes same position as stated. r I e Fig. 7 is the same as Fig. 6 but in reverse position,- the object of which is to rotate the ring-'30 in the opposite d.irection ;in,case

intolocked of using thecutter head for-left hand screw threading, in which casereverse hand outter holders must'be employed. In order .to

bring these links into the reverse position. .screw 38 must be released far enough for its inner end to escape the recess 39 in the body A allowing the sleeve 35 to move back far enough for link- 50 to swing to the other side returningsaid sleeve 35 to again engage said recess 39 with screw 38 WhlCll w1ll be clear.

oving the ringv 4O link 50 causes slight rotation of ring 30to The object of said recess 39 and screw 38' engaging'therewith is to limit the rearward movement of sleeve 35 so that the die may "not be opened more-than necessary as well also as to prevent the link 50 from locking 1 the head or die in an open position asmay be'seen. I a.

The ring 30-i1rFigs3 shows, the .four links 12jpivoted thereto on pin 14. They are shownin one position in full lines and the reverse position in dottedlines. One position being for righthand screw cutting and the other for left hand work; The object of. this reversal is to keep the recess13 in lines. i

i connection.

A ring 60 is mounted on the sleeve 2 of the spindle 1 having an annular groove 65 .in'its face which bears against a fiber ring 61 located in an annular recess or-groove on the rear of the body A by,means of springs 62 preferably two in number, 10-- cated in seats in the bearing 63 of the machine. Said ring has an'openingfifi on the opposite side from the groove for a pipe Holes 64 communicate from said grooves 65 through the bodyA to the bearings for the trunnions 6 of the cutter holders B. An annular space around stud 7 forms a passage to the under side of thethreaded sleeve 9. .A diagonal hole 67 from 3 this passage, through the cutter holder makes a passage to deliver cutting lubricant to the cutting pointof each cutter, said hole forming a jet for the lubricant.

Having described the parts and arrange- 'ment of same, I will briefly recapitulate the operation of the cutter head. The'die being closed as shown in Figs. 1 and 2 the method of opening is by the rearward movement on the body A of the sleeve 35 carrying mounted'thereonthe ring 10 which causes said ring 40 to part from ring 30 which being connected together -with links ,50 causes ring 30 to have a slight rotation because of sleeve 35 being connected to the body against rotation which being connected to each of said cutter holders by the links 12 said slight rotation operates, through tilting the cutter holders on their trunnions to open the die and it is therefore obvious that the opposite motion of sleeve aawiu operate to close the die.

Having now fully described my in-.

'vention what I claim as new-and desire to secure by Letters'Patent is:'-

1. A cutter head comprising a bod cutter holders pivotally,secured on the ace of saidbody, cutters mounted in said holders forming a cutting die, a rin mounted. on said body, said ring connecte with eachof said cutter holders by pivotal links and means for moving said rings circumferentially for opening and closing said die.

2. A cutter head comprising a bod ,cutter holders pivotally secured on the ace of said body, cutters mounted in said holders cutters mounted in said holders forming a cutting die, a ring mounted on said body, pivotal links connecting said ring with each of said holders, said ring mounted to move circumferentially on said body, another ring mounted to move longitudinally with said body, and connected by a link to said first named ring b which in its longitudinalmovement sai first named ring is caused tomojve a limited amount circumferentially -to open and close the said die. I

4. A cutter-head comprising a body, cutter holders-mounted to move on said body, cutters mounted in each of said cutter holders forming a cutting die, a ring mount-- ed on said body and connected with each ofsaid cutter holders by a link connection, means to move -saidring circumferentially for openin and closing said die andmeans therewith or adjusting the size ofsaid die.

ter-holders pivoted on the face of saidbody,

cutters: mounted in said. holders forming a cutting die, a ring mounted on said body,

pivoted links connectingsaid holders with said ring ata point substantially op osite its pivot from thecutting point 0 7 said cutters. i 1 6. A cutter head comprising a body, outter holders mounted onsaid body a ring mounted on said body, links connecting each of said cutter .vholders .with said ring, another ring mounted on saidvbod tovmove longitudinally but. not,v circum erentially therewith, still another ring mounted upon .saidlast named. ring secured thereto in circumferential adjustment,a link connecting said last named ring with-the first named ring, to which the cutter holders are connected by which a limited circumferential movement is given to-said first named ring. a a

7. A cutter head comprising a body outter holders mounted to move on said im ody,. xcutters secured to said holders by a dovehavingholding edges engaging with 'cross grooves in the back of said cutter, said screw 'plu'g'engaging withv said holding block for the purposeof-longitudinal adjustment of the said cutters and end movement. r a v 8.'A cutter holder with cutters mounted thereon having. longitudinal screw-thread forming grooves on the face thereof, a longitudinal projection on the back of said cutters forminga dovetail, said'dovetail fitting in a dovetailed recessin said cutter holder,

said cutter havinglcross grooves in its back, a slot insaidcuttertholder adjacent to said dovetailed recess, a screw threaded portion securing same against ter, and means-for normally holding said.

block in engagement with said grooves.

9. A cutter holder having a dovetailed recessfor the engagement of a cutter fitting thereto, a holding block engagin with said g cutter to hold same from longitu inal movement, a screw threaded plug in said holder, said plug engagin with said holding block, a slot in said holder to permit of yielding, a perforation crossing said slot, a screw inserted in said perforation by which said cutter is firmly clamped on its dovetailed connection.

10. A cutter head comprising a body, cutter holders movably secured to said body, cutters mounted in said holders to form a cutting die; a ring mounted on said body, means for connecting said ring to said cut-z ter holders, another ring mounted on said body secured against circumferential move- -ment but free to move longitudinally, a ring mounted upon said last named ring, means for securing said rings together and pro- 'vide for circumferential adjustment between them for the purpose of adjusting the size of the die, and means whereby said last named ring in its longitudinal movement causes the v first named ring to move circumferentially.

11. A cutter holder having a cutter mounted thereon, said cutter having holding grooves across its back, a block havin a. holding edge adapted to engage with sai grooves, a screw plug engaging a screw. threaded perforation in said holder, said screw plug engaging said block for the purpose of lonitudinal adjustment of said outter and to hold same against longitudinal movement. v

12. A cutter holder having a cutter secured thereon, said cutter having holding grooves across its back, a block adapted to engage with said grooves, a screw 1) ug engaging a screw threaded perforation in said holder, said screw plug engaging said blockfor the purpose of longitudinal adjustment of said cutter and to hold same against end movement, means for raising said block from engagement with said cutters for the purpose of freely removing said cutter and means for normally holding said block in engagement therewith.

13. A cutter holder, a cutter secured thereto having longitudinal thread forming rooves on their face, with transverse holding grooves on their back,a holding block seated in a slot in said holder engaging with the transverse grooves of said cutter, a

screw plug engaging with said block for the purpose of adjusting and holding said cutteragainst longitudinal movement,- means for releasing said block from said cutter for the free removal of said cutter, means for holding said block normally in engagement with said cutter and means for rigidly clamping said cutters.

14. In a cutter head, a cutter holder, a cutter having longitudinal cutting grooves on its face, a longitudinal dovetailed raised portion on its back, a dovetailed recess in said cutter holder in which said dovetailed portion of said cutter fits, cross holding grooves on the back of said cutter, a slot in said holder adjacent to its recess, a holding block seated in said slot and in engagement with the cross grooves of said cutter, a screw plu in screw threaded engagement with sai holder, said plug engaging with said block for holding said cutter against longitudinal movement, means for raising said block out of engagement of said cutter,

means for normally holding same in engagement therewith, a slot in said holder to produce a yielding of same between the sides of saidfdovetailed recess, anda screw for-clamping said cutter upon said dovetail portion.-

15'. A cutter head comprising a body, cut-.

ter holders movably secured to the face of connected with each of said cutter holders by a pivotal link connection, said ring'having a circumferential movement, another ring mounted on the said body secured against circumferential movement but free to a limited longitudinal movement, said last named ring having another ring mounted on it and secured to same in circumferential adjustment, said last named ring connected with the first named ring by a link by which means the'limited circumferential movement of the said first named ring is produced and by which the said die is caused to open and close.

17. A cutter holder having a cutter secured thereon, said cutter having holding grooves across its back, a block adapted to engage with said grooves, a screw plug, engaging screw threads in said holder, said screw plug engaging said block for the purpose of longitudinal adjustment of said cutter, and to hold same against longitudinal movement.-

18. A cutter head comprising a body, out- In testimony whereof I affix my signature ter holders pivoted in said body, cutters in presence of two Witnesses.

mounted on said holders, a ring mounted on ABRAHAM B LANDIS said body, means for connecting said ring 5 with said holders at a point on substantially Witnesses:

the opposite side of said pivot from the cut- HENRY T. RULLMANN,

ting point of said cutter. 3 WM. E. GUERTLER. 

